# encoding: utf-8

def countEnglish(s):
	d = dict()
	if s.isalpha():
		s = s.lower()
		for c in s:
			d[c] = d.setdefault(c, 0) + 1
	else:
		print('not english letter')
		
	for c in sorted(d, reverse=True):
		print('{}:{}'.format(c, d[c]))
		
countEnglish('adKLljdqqqqpperedoodd')
countEnglish('dsfds 9003m 78')